同学们梳理了教材中与压强知识相关的实验，如图所示，其中分析正确的是
A．甲图实验，装有水的瓶子竖放在海绵上，瓶中水越少，海绵凹陷越明显
B．乙图实验，当微小压强计的探头在水中深度逐渐增大时．U形管两边液面高度差不变
C．丙图实验，测出拉开吸盘时大气对吸盘的压力和吸盘的面积，可估测大气压强的值
D．丁图实验，向外拉活塞，试管内停止沸腾的水再次沸腾，可知气压减小，水的沸点升高
答案：C
Friend is better than fortune. Friend is worse than poison in some  cases. The two sentences above are opposite and seem to be unreasonable but they can be explained as follows: the first refers to all good friends who drive us towards good while the second all bad ones who lead us to wrong ways.My ideal friend is of course a good friend whose goodness is shown below---he has no bad likings, such as smoking and drinking. He lives in frugality (节俭). He studies hard so as not to waste his golden time. At home he honors his parents and loves his brothers; at school he respects his teachers and shares feelings with his classmates. He treats those truly who are true to him. In a word, he has all the good characters better than mine. I can follow him as a model. With his help I am free from all difficulties. Indeed, if I have such a person as my friend, I shall never fear difficulty and I shall never know the existence of the word "failure". 小题1:This passage tells us ( )
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